/* * Copyright 2002-2018 the original author or authors. * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ package org.springframework.web.reactive.socket.server.upgrade; import java.util.function.Supplier; import reactor.core.publisher.Mono; import reactor.netty.http.server.HttpServerResponse; import org.springframework.core.io.buffer.NettyDataBufferFactory; import org.springframework.http.server.reactive.AbstractServerHttpResponse; import org.springframework.http.server.reactive.ServerHttpResponse; import org.springframework.lang.Nullable; import org.springframework.web.reactive.socket.HandshakeInfo; import org.springframework.web.reactive.socket.WebSocketHandler; import org.springframework.web.reactive.socket.adapter.NettyWebSocketSessionSupport; import org.springframework.web.reactive.socket.adapter.ReactorNettyWebSocketSession; import org.springframework.web.reactive.socket.server.RequestUpgradeStrategy; import org.springframework.web.server.ServerWebExchange; /** * A {@link RequestUpgradeStrategy} for use with Reactor Netty. * * @author Rossen Stoyanchev * @since 5.0 */ public class ReactorNettyRequestUpgradeStrategy implements RequestUpgradeStrategy { private int maxFramePayloadLength = NettyWebSocketSessionSupport.DEFAULT_FRAME_MAX_SIZE; /** * Configure the maximum allowable frame payload length. Setting this value * to your application's requirement may reduce denial of service attacks * using long data frames. * <p>Corresponds to the argument with the same name in the constructor of * {@link io.netty.handler.codec.http.websocketx.WebSocketServerHandshakerFactory * WebSocketServerHandshakerFactory} in Netty. * <p>By default set to 65536 (64K). * @param maxFramePayloadLength the max length for frames. * @since 5.1 */ public void setMaxFramePayloadLength(Integer maxFramePayloadLength) { this.maxFramePayloadLength = maxFramePayloadLength; } /** * Return the configured max length for frames. * @since 5.1 */ public int getMaxFramePayloadLength() { return this.maxFramePayloadLength; } @Override public Mono<Void> upgrade(ServerWebExchange exchange, WebSocketHandler handler, @Nullable String subProtocol, Supplier<HandshakeInfo> handshakeInfoFactory) { ServerHttpResponse response = exchange.getResponse(); HttpServerResponse reactorResponse = ((AbstractServerHttpResponse) response).getNativeResponse(); HandshakeInfo handshakeInfo = handshakeInfoFactory.get(); NettyDataBufferFactory bufferFactory = (NettyDataBufferFactory) response.bufferFactory(); return reactorResponse.sendWebsocket(subProtocol, this.maxFramePayloadLength, (in, out) -> { ReactorNettyWebSocketSession session = new ReactorNettyWebSocketSession( in, out, handshakeInfo, bufferFactory, this.maxFramePayloadLength); return handler.handle(session); }); } }